X-Git-Url: https://git.llucax.com/z.facultad/75.52/treemulator.git/blobdiff_plain/46f8786311d03a7d9869d814a3d6f020a3498ed4..baff628083af0bab49fafdab5ed0445a6407f2de:/src/btree.cpp

diff --git a/src/btree.cpp b/src/btree.cpp
index 6771746..2701b3a 100644
--- a/src/btree.cpp
+++ b/src/btree.cpp
@@ -19,6 +19,9 @@ BTree::BTree (const std::string &name, unsigned int block_size, int tt, int kt,
 	header.block_size = block_size;
 	header.tree_type = tt;
 	header.key_type = kt;
+	header.block_data_counter = 0;
+	strcpy (header.magic, "DILUMA");
+	header.magic[6] = '\0';
 	WriteFileHeader ();
 
 	/* Creo el primer bloque vacio */
@@ -33,9 +36,88 @@ BTree::BTree (const std::string &name, unsigned int block_size, int tt, int kt,
 	delete [] node;
 }
 
+BTree* BTree::Open (const std::string &name)
+{
+	/* Leo los bloques recuperables */
+	FILE *fp;
+	BTree *tree = new BTree ();
+
+	std::string del = name + ".del";
+
+	fp = fopen (del.c_str (), "wb");
+	if (fp != NULL) {
+		uint i;
+
+		while (fread (&i, 1, sizeof (uint), fp)) {
+			tree->deleted_nodes.push_back (i);
+		}
+
+		fclose (fp);
+	}
+
+	del = name + ".blockdel";
+
+	fp = fopen (del.c_str (), "wb");
+	if (fp != NULL) {
+		uint i;
+
+		while (fread (&i, 1, sizeof (uint), fp)) {
+			tree->deleted_block_data.push_back (i);
+		}
+
+		fclose (fp);
+	}
+
+	tree->filename = name;
+	tree->fp = fopen (name.c_str(), "rb+");
+	if (!fp) {
+		/* TODO : mandar una exception ? */
+		delete tree;
+		return NULL;
+	}
+	tree->ReadFileHeader ();
+
+	if (strcmp ("DILUMA", tree->header.magic)) {
+		/* Arbol no tiene magic!! */
+		delete tree;
+		return NULL;
+	}
+
+	return tree;
+}
+
 BTree::~BTree ()
 {
 	fclose (fp);
+
+	std::string del = filename + ".del";
+
+	fp = fopen (del.c_str (), "wb");
+	std::list<uint>::iterator it = deleted_nodes.begin ();
+
+	while (it != deleted_nodes.end ()) {
+		uint i = *it;
+		fwrite (&i, 1, sizeof (uint), fp);
+		it++;
+	}
+
+	del = filename + ".del";
+
+	fp = fopen (del.c_str (), "wb");
+	it = deleted_block_data.begin ();
+
+	while (it != deleted_block_data.end ()) {
+		uint i = *it;
+		fwrite (&i, 1, sizeof (uint), fp);
+		it++;
+	}
+	fclose (fp);
+}
+
+void BTree::ReadFileHeader ()
+{
+	fseek (fp, 0L, SEEK_SET);
+	fread (&header, 1, sizeof (BTreeFileHeader), fp);
 }
 
 void BTree::WriteFileHeader ()
@@ -54,14 +136,19 @@ void BTree::WriteBlock (uchar *block, uint num)
 void BTree::AddKey (const Clave &k)
 {
 	uint left, right;
-	Clave *kout;
+	Clave *kout, *in;
+
+	in = k.Clone ();
+	in->SetBlockData ( GetNextBlockData () );
 
 	try {
-		kout = AddKeyR (k.Clone (), 0, left, right);
+		kout = AddKeyR (in->Clone (), 0, left, right);
 	} catch (Exception *e) {
 		throw e;
 	}
 
+	delete in;
+
 	if (kout) {
 		unsigned short level;
 		/* Debo dejar la raiz en el nodo 0, por lo que paso el nodo
@@ -533,6 +620,7 @@ void BTree::DelKeyFromLeaf (Clave *k, uint node_num, uint padre)
 		if ((*data) == (*(*it))) {
 			BTreeData *aborrar = (*it);
 			node_keys.erase (it);
+			deleted_block_data.push_back (aborrar->GetKey ()->GetBlockData ());
 			delete aborrar;
 			break;
 		}
@@ -1138,9 +1226,9 @@ uchar *BTree::NewBlock (uint &num)
 	BTreeNodeHeader nh;
 
 	std::list<uint>::iterator it;
-	it = deleted_nodes.begin ();
 
-	if (it != deleted_nodes.end ()) {
+	if (deleted_nodes.size ()) {
+		it = deleted_nodes.begin ();
 		num = *it;
 		deleted_nodes.erase (it);
 	} else {
@@ -1249,3 +1337,18 @@ int BTree::type () const
 {
 	return header.key_type;
 }
+
+uint BTree::GetNextBlockData ()
+{
+	uint n;
+	if (deleted_block_data.size ()) {
+		std::list<uint>::iterator it = deleted_block_data.begin ();
+		n = *it;
+		deleted_block_data.erase (it);
+	} else {
+		n = header.block_data_counter++;
+	}
+
+	return n;
+}
+